#33030 [NEW]: Floating point subtraction : incorrect precision
| From: | justandy at lagparty dot org | Date: | Fri, 13 May 2005 20:59:14 +0000 |
| Subject: | #33030 [NEW]: Floating point subtraction : incorrect precision | ||
| Groups: | php.bugs | ||
| Request: | Send a blank email to php-bugs+get-78987@lists.php.net to get a copy of this message | ||
From: justandy at lagparty dot org
Operating system: XP
PHP version: 5CVS-2005-05-13 (dev)
PHP Bug Type: Math related
Bug description: Floating point subtraction : incorrect precision
Description:
------------
PHP 5.0.0 (cli) (built: Jul 13 2004 21:39:58)
Copyright (c) 1997-2004 The PHP Group
Zend Engine v2.0.0, Copyright (c) 1998-2004 Zend Technologies
//
Subtraction for floating point numbers is incorrect.
I searched the existing bug reports and could not find anything similar.
Running the same version on LINUX reports the correct value.
Reproduce code:
---------------
<?
//CORRECT: 0.03
echo 1.06 - 1.03;
//WRONG : 0.029999999999999
echo 6.06 - 6.03;
?>
Expected result:
----------------
0.03
Actual result:
--------------
0.029999999999999
--
Edit bug report at http://bugs.php.net/?id=33030&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=33030&r=trysnapshot4
Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=33030&r=trysnapshot50
Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=33030&r=trysnapshot51
Fixed in CVS: http://bugs.php.net/fix.php?id=33030&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=33030&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=33030&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=33030&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=33030&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=33030&r=support
Expected behavior: http://bugs.php.net/fix.php?id=33030&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=33030&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=33030&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=33030&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=33030&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=33030&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=33030&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=33030&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=33030&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=33030&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=33030&r=mysqlcfg